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Theconeeptof"PolygencticandCompoundDcposit"wasproposedbyProfessorChenGuoda(1975,1977,1979,1982,1988).Thispapcrmakesuseofthethcorytothcrcscarchoncoalbedmethanedeposit,andproposestheidea"PolygeneticandCompoundCoa1bcdMethancDoposit"’Coa1b